Cyrtinus howdeni Wappes, Santos-Silva and Nascimento, 2020

Wappes, James E., Santos-Silva, Antonio & Nascimento, Francisco Eriberto de L., 2020, Taxonomic notes on Western Hemisphere Cyrtinini (Coleoptera: Cerambycidae: Lamiinae) including description of two new Cyrtinus LeConte species, Insecta Mundi 751, pp. 1-15 : 6-7

Cyrtinus howdeni Wappes, Santos-Silva and Nascimento , new species

( Fig. 18–21 )

Description. Holotype male. Integument mostly dark-brown; apex of last segment of maxillary and labial palpi yellowish-brown; anterior area of labrum pale-yellow; scape light-brown; pedicel yellow basally, gradually brown toward apex; antennomeres III–IX yellow anteriorly, dark brown posteriorly (yellow area gradually constricted toward IX); elytra slightly lighter on anterior third, with small, rounded darkened maculae on inclined area (appearing to be punctures); ventral surface of thorax slightly dark reddish-brown; femoral peduncles yellowish-brown; tibiae dark-brown basally, gradually dark reddish-brown toward apex; tarsi reddish-brown; abdominal ventrites I–III nearly black, IV–V lighter, especially V.

Head. Frons slightly convex, finely rugose with fine punctures interspersed; with short, decumbent, sparse grayish-white setae, more yellowish centrally toward clypeus; with a few long, erect dark setae laterally. Vertex and area behind eyes with sculpturing as on frons, smoother on vertex close to prothorax; with short, decumbent, sparse grayish-white setae between antennal tubercles and upper eye lobes, glabrous on remaining surface of vertex and nearly all of surface behind upper eye lobes. Area between ocular lobes finely punctate, with grayish-white pubescence not obscuring integument; area behind this region nearly smooth, glabrous. Area behind lower eye lobes nearly smooth superiorly, slightly rugose close to eye inferiorly; with a few short grayish-white setae near eye, glabrous on remaining surface. Genae 1.5 times length of lower eye lobe, rugose, except smooth at apex; with a few short grayish-white setae toward clypeus, slightly longer toward inferior area. Postclypeus coarsely, shallowly, sparsely punctate; with a few short, decumbent yellowish setae on wide central area, and long, erect, sparse dark setae interspersed. Labrum with long, erect, sparse yellowish-brown setae posteriorly, long, erect, abundant pale-yellow setae anteriorly. Distance between upper eye lobes 0.40 times length of scape (0.38 times distance between outer margins of eyes); in frontal view, distance between lower eye lobes 0.70 times length of scape (0.67 times distance between outer margins of eyes). Antennae 1.8 times elytral length, reaching elytral apex at basal third of antennomere X. Scape gradually widened toward apex; with short, decumbent, sparse white setae dorsally and laterally, with a few short, erect dark setae ventrally; pedicel with a few white setae dorsally, and one long brownish seta directed backward ventrally. Antennomeres with sparse white setae dorsally and laterally, more abundant toward XI; III–VII with tuft of long yellowish setae directed backward on ventral apex (more brownish depending on light intensity); antennomeres III–IX slightly pedunculate-clavate; X–XI cylindrical. Antennal formula (ratio) based on length of antennomere III: scape = 2.50; pedicel = 0.50; IV = 1.15; V = 1.10; VI = 1.10; VII = 0.90; VIII = 0.90; IX = 0.90; X = 0.80; XI = 0.75.

Thorax. Pronotum finely, abundantly punctate on narrow area close to anterior margin, finely, somewhat rugose-punctate on posterior constriction, with a few coarse punctures on wide central area; with short, decumbent, sparse grayish-white setae close to anterior margin, abundant on posterior constriction, and a few minute grayish-white setae on wide central area; with long, erect, sparse brownish setae. Sides of prothorax rugose anteriorly and posteriorly, smooth centrally; with a few grayish-white setae, slightly more abundant posteriorly; with one long, erect dark seta posteriorly. Prosternum rugose on wide central area, nearly smooth laterally; with short, decumbent, sparse grayish-white setae on wide central area, glabrous laterally. Prosternal process with sculpturing and setae as on wide central area of prosternum; narrowest area slightly shorter than 0.5 times width of procoxal cavity. Ventral surface of mesothorax with sparse grayish-white pubescence on center of mesoventrite, denser on sides of mesoventrite, with oblique white pubescent band on mesanepisternum (setae nearly scale-shaped). Metanepisternum and metaventrite with a few decumbent grayish-white setae, except transverse white band with nearly scale-shaped setae on posterior area of metanepisternum and sides of metaventrite (following that on elytra). Scutellum glabrous basally, with short, decumbent, abundant grayish-white setae posteriorly. Elytra. Nearly parallel-sided in anterior 2/3, them distinctly narrowed toward individually rounded apex on posterior third; moderately flattened on anterior quarter, convex on posterior 3/4; with elevated, subtriangular crest anteriorly, with a single long, erect dark seta at apex; anterior third coarsely punctate; remaining surface finely, sparsely punctate; with transverse white band of nearly scale-shaped setae close to suture on anterior quarter, another band with same type of setae starting dorsally slightly before middle of elytra (fragmented on this area), not reaching suture, following obliquely toward anterior quarter, then transverse on inclined area, not reaching epipleural margin; with long, sparse, erect dark setae dorsally, and short, erect, sparse yellowish-white setae on inclined area. Legs. Femora with sparse white pubescence (denser on longitudinal band along dorsal surface of femoral club). Tibiae with sparse white pubescence basally, gradually more abundant, bristly toward apex on meso- and metatibiae, distinctly denser on ventral posterior third of protibiae and dorsal third of mesotibiae.

Abdomen. Ventrites with a few decumbent yellowish-white setae. Apex of ventrite V nearly truncate.

Dimensions in mm. Total length, 2.40; prothoracic length, 0.60; anterior prothoracic width, 0.55; posterior prothoracic width, 0.45; widest prothoracic width, 0.60; humeral width, 0.70; elytral length, 1.50.

Type material. Holotype male from MEXICO, Cordoba, 21.III.1908, Frederick Knab col. ( FSCA, formerly ACMT). There are places named Cordoba in at least three different Mexican states, besides the well-known city in Veracruz, thus it is not certain exactly where the specimens are from.

Etymology. Named after the late Henry Howden, who described several species and one genus in Cyrtinini .

Remarks. Following the key by Howden (1959), Cyrtinus howdeni can be included in the alternative of couplet “10”, with C. hubbardi Fisher, 1926 (see photograph of the holotype at Bezark 2019) but differs by the notably thicker antennomeres (slender in C. hubbardi ). It differs from C. bordoni Joly and Rosales, 1990 , by the elytra with two white dorsal pubescent bands, the largest obliquely pointed backward (one, mostly transverse, in C. bordoni ). The new species differs from C. sandersoni Howden, 1959 by the basal tubercle of the elytra strongly elevated (obsolete in C. sandersoni ).

Figures

Figures 18–21. Cyrtinus howdeni, holotype male. 18) Dorsal habitus. 19) Ventral habitus. 20) Lateral habitus. 21) Head, frontal view.